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Patented Dec. 4, 1188@ 1 emma-ms PATENT @tripa rnnnmonlrqirmncs, "oronicneo, ILLINOIS, Assienon or onu-HALF "frowvILLmM n. FLETCHER, or sAMnPLAGE.

LocK.

SPECIFICATION forming part of LettersPatent No. 289,542, dated December4c, 1883.

Appiiduon filed May 22,1583. (Model.)

tures in the construction and arrangement of the parts, as willbehereinafter more fully set forth in detail in the specieation, andpointed out in the claim. i i Figure lis a side elevation, the cap-platebeing removed to show the interiorof the lock, the door and jamb-postbeing in section. y Fig. 2 is a horizontal transverse section intheplane 2 2, Fig. l; Fig. 3, d a vertical section in the plane 3 3, Fig.l, looking in the direction vindicated by the arrows; Fig. 4, a faceview of the keeper or striking plate. Referring to the drawings,A-represents the door; A, the case or box inclosing and retaining thelock mechanism; A2,the keeper or striking plate, and As the face-plate,attached to and forming a part of the case A. The recess A4, for thereception of the lock, is cut out from the front edge of the door, andis secured in place by the face-plate A3, attached to the door by thescrews A5 A5, and to the lock-case by the screws A A, as shown in Fig. lof the drawings. d rlhe keeper A? is `provided with the usual apertures,and thejamb-post B with recesses corresponding thereto, for thereception of the latch-bolt B and the locking-bolt C. The inner `end ofthe latch-bolt passes through an aperture in the outer end of therectangular sliding frame a, and is secured in relation thereto byl thepin a. By this arrangement the latch-bolt is adapted to movesimultaneously with the frame c, or may be forced back independentof theframe a. The frame a is adapted to have an endwise adjustment, and isforcedbackward by the longitudi- Y nal movement of thespindle B2,providedwith the trianguiarprojection B3, the bearing-sur- 5o facelofwhich is slightly curved, and by frici tionalicontact of the same withthe beveled lug a2, `formed integral with the frame a, the latchbolt isreleased from engagement with the keep er. ,The lug a2 projectslaterally from and a little beyond the plane of the frame a, throughwhich the spindle B? passes. This spindle is not susceptible of a rotarymovement, but only an endwise adjustment. The latch-bolt is drawn back.bypulling on the handle B4, or by pushing in on `the knob B5, as thecase may be. The latch-bolt is automatically thrown out by i means ofthe spring a3, coiled around the post :the cut-away part of the bolt,and to bring it on a level with the head of thebolt. The back partsofthe series of tumblers are providedwlth` 7 5 `the irregular slots C2,the transverse parts of which are slightly curved to allow the tumblersto have a corresponding lateral movement,

while the rectangular parts of the slots extending backward provide foralongitudinal move- So ment of the bolt independent of the tumblers. Theends ofthe tuinblers are retained in proper relation to the locking-boltby means of the rectangularpost C, attached to the bolt. The lower edgesof these parts of the tumblers are `8 5 cut away in different curvedplanes, so that a key of a particular shape is required in order l* tobring the tumblers` into the right position for moving the bolt. d

. Each of the series of tumblers has an inde- 9o pendent lateralmovement relative to the others. The opposite ends of the series oftumblers are rounded and perforatedto engage with the pivot-post Gt,which is rigidly attached to the back of the lock-case, and projectsthrough g 5 the elongated slot C5 in the locking-bolt, so as to permitof a longitudinal adjustment of the same. Each tumbler is provided witha spring,

C, arranged in the same plane therewith, one

end of said spring being secured to the tum- Ioo 1 bler, while theopposite end has a bearing against and is retained in place by the postD. These springs serve to automatically throw the back ends of thetumblers down, so that the offset made by the widest part of the slot C2engages with the post C3, and thereby prevents all possibility of thebolt being forced out of the locking position, (shown in Fig. 1,) exceptby the use of the proper key, thus avoiding` vthe danger of having thebolt sprung back by inserting an instrument into the door-jamb. The boltG cannot be thrown into a locking position by means of a key, but isautomatically forced out into engagement with the keeper by means of thespring Cl, coiled around the post O8. The inner end of the trigger D issecured to the post D2, and is adapted to have a pivotal movement fromthis point. The opposite end of the trigger projects a little beyond thefaceplate, attaching the lock to the door, and engages with the beveledslot D3 in the keeperplate. (Shown in Fig. 4 of the drawings.) The upper'side of the trigger is provided with the upward-projecting post d,which is adapted to engage with a corresponding aperture, d', in theunder side of the head of the locking-bolt, which serves to retain thebolt in an unlocked position against the pressure of the spring C7 whenthe door to which the lock is attached is open. Now, in closing thedoor, the outer projecting end of the trigger is forced downward byreason of coming in contact with the beveled line d2 on the keeper,(shown in Fig. 4 of the drawings,) which movement has the effect ofreleasing the locking-post d from engagement with the under side of thelockingbolt, which is then thrown out into'a locking position by thespring C7. The trigger is automatically thrown into engagement with thelocking-bolt by means of the spring b4. Above the locking-bolt is placedthe lever-catch D", which has an axial bearing near its longitudinalcenter on the post D. Thefront end of face-plate, through an elongatedaperture in tl i c 5]@ j same, which admits of this end of the catch ingthrown up or down, as may be required, and imparts a correspondingmovement to the opposite or inner end. rIhe object of this levercatch isto engage with the locking-bolt and prevent the same from being throwninto a locking position when the door is closed and the trigger thrownout of engagement withthe locking-bolt. This is done by tipping up theouter end of the catch, which throws down the inner end and engages itwith the notch d5 in the upper edge of the locking-bolt, which securelyholds the bolt in an unlocked position and permits of the door beingclosed without locking the same. By simply throwing the outer end of thecatch D* down the opposite end is released from contact with thelockingbolt, and the operation of automatically locking the door byclosing the same is the ysame as before described.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

The combination, with the locking-bolt C, having the aperture c?, of thespring C7, the trigger D', provided with the upward-projecting post d,the post D2, the spring b4, and ,the keeper A2, provided with beveledslot D3, whereby said bolt is automatically thrown into a lockingposition by the closing of the door, 8o substantially as described.

FREDRICH P. KRINGS.

Witnesses:

